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Term of derivative interest rate swap.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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Face (par) amount of debt instrument at time of issuance.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Amount of the required periodic payments including both interest and principal payments.

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Weighted average interest rate of debt outstanding.

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Description of the inputs and valuation technique(s) used to measure fair value.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Date the credit facility terminates, in CCYY-MM-DD format.

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Date the credit facility first became available, in CCYY-MM-DD format.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Long-Term Debt - Additional Information (Detail) - USD ($)			1 Months Ended		12 Months Ended
	Feb. 15, 2017	Jun. 26, 2015	Dec. 31, 2014	Aug. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Mar. 31, 2017	Jul. 29, 2014	Jul. 31, 2013
Credit Agreement [Member]
Debt Instrument [Line Items]
Maturity date of amended and restated credit agreement					Jul. 30, 2017
Credit facility borrowing base					$ 80,000,000
Credit facility, interest rate description					The Company’s borrowing rates in the credit facility provided for base rate loans at the prime rate (3.75% at December 31, 2016) plus applicable margin utilization rates that ranged from 1.50% to 2.50%, and LIBO rate loans at LIBO published rates plus applicable utilization rates (2.50% to 3.50% at December 31, 2016). At December 31, 2016, the Company had in place one base rate loan and one LIBO rate loan with effective rates of 6.00% and 3.87%, respectively
Outstanding borrowings under revolving credit facility					$ 63,000,000
Weighted-average interest rate of borrowings					4.49%
Credit facility remaining borrowing capacity					$ 17,000,000
Interest swap agreements period					2 years
Settlement of interest rate swaps					$ 7,000	$ 284,000
Additional Equipment Loan [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, effective percentage				3.40%
Credit facility remaining borrowing capacity				$ 1,200,000
Company's bank debt					$ 2,910,000
Equipment Loan, face amount								$ 6,000,000
Equipment Loan, monthly payment				87,800
Equipment Loan, maturity date					Jul. 31, 2019
Additional equipment Loan, drawings			$ 500,000	$ 4,800,000
Equipment Loan, interest rate description					Interim draws on this facility carried a floating interest rate, payable monthly at the LIBO published rate plus 2.50% and on June 26, 2015 converted into a fixed term loan requiring monthly payments
Fair Value Measurements, Valuation Techniques					discounted cash flow model
Additional Equipment Loan [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Debt Instrument [Line Items]
Debt Instrument, Fair Value Disclosure					$ 6,300,000	$ 9,400,000
Revolving Line of Credit and Letter of Credit Facility [Member] \| Credit Agreement [Member]
Debt Instrument [Line Items]
Credit facility borrowing capacity					$ 250,000,000
Fixed Term Loan [Member] \| Additional Equipment Loan [Member]
Debt Instrument [Line Items]
Equipment Loan, monthly payment		$ 8,700
Equipment Loan, maturity date					Jun. 26, 2020
Prime Rate [Member] \| Credit Agreement [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, effective percentage					3.75%
Base Rate [Member] \| Credit Agreement [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, effective percentage					6.00%
London Interbank Offered Rate (LIBOR) [Member] \| Credit Agreement [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, effective percentage					3.87%
London Interbank Offered Rate (LIBOR) [Member] \| Additional Equipment Loan [Member]
Debt Instrument [Line Items]
LIBOR rate loans					2.50%
Base Rate And Libor [Member] \| Credit Agreement [Member]
Debt Instrument [Line Items]
Debt instrument basis weighted average interest rate spread on variable rate					3.93%	3.44%
Equipment Loan [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, effective percentage					3.95%
Company's bank debt					$ 3,340,000
Equipment Loan, face amount									$ 10,000,000
Equipment Loan, monthly payment					$ 184,000
Equipment Loan, maturity date					Jul. 31, 2018
Subsequent Event [Member] \| Credit Agreement [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, effective percentage							3.53%
Outstanding borrowings under revolving credit facility							$ 24,800,000
Subsequent Event [Member] \| 2017 Credit Agreement [Member]
Debt Instrument [Line Items]
Credit facility borrowing capacity	$ 300,000,000
Maturity date of amended and restated credit agreement	Feb. 15, 2021
Credit facility borrowing base	$ 75,000,000
Credit agreement date	Feb. 15, 2017
Minimum [Member] \| Prime Rate [Member] \| Credit Agreement [Member]
Debt Instrument [Line Items]
LIBOR rate loans					1.50%
Minimum [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Credit Agreement [Member]
Debt Instrument [Line Items]
LIBOR rate loans					2.50%
Maximum [Member] \| Prime Rate [Member] \| Credit Agreement [Member]
Debt Instrument [Line Items]
LIBOR rate loans					2.50%
Maximum [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Credit Agreement [Member]
Debt Instrument [Line Items]
LIBOR rate loans					3.50%
Interest Rate Swap [Member] \| Credit Agreement [Member]
Debt Instrument [Line Items]
Swap agreement date					2012-07
Commenced date					2014-01
Termination date					2016-01
Company's bank debt					$ 75,000,000
Interest Rate Swap [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Credit Agreement [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate					0.563%